W3Total w3tc_rewrite_test but received: 200 OK is a normal?

In W3total page caching, I use disk to enhance option. When I’m enabling, page caching debugging, it displays following message. As far as I know, 200 header response indicates the OK result. So following message is a normal one?

.htaccess file contains rules to rewrite url https://www.example.com/w3tc_rewrite_test into https://www.example.com/?w3tc_rewrite_test which, if handled by plugin, return “OK” message.
The plugin made a request to https://www.example.com/w3tc_rewrite_test but received: 200 OK instead of “OK” response.

Thanks!

https://www.ads-software.com/plugins/w3-total-cache/